Process for the preparation of 4,4'-dihydroxydiphenyl ether

C - Chemistry – Metallurgy – 07 – C

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260/616.5

C07C 43/295 (2006.01) C07C 41/09 (2006.01) C07C 41/34 (2006.01)

Patent

CA 1240706

ABSTRACT OF THE DISCLOSURE The invention relates to a process for the preparation of 4,4'-dihydroxydiphenyl ether by dehydration of hydroquinone using sulfonic acids or sulfuric acid as catalysts at ele- vated temperatures. The dehydration product is stirred with an excess of water at 80 to 110°C. The higher con- densed byproducts which are undissolved during this are separated off, and the ether desired is allowed to crystal- tize out of the filtrate obtained.

518066

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